1. It took us an hour to do the English test last week.

2. We haven't seen Tome since he moved to London.

3. If people didn't use too many cars for transportation, the environment would not be seriously polluted

- đây là câu điều kiện loại 2: ko có thực ở hiện tại, điều kiện trái với thực tế ở thời điểm hiện tại

4. Mark asked Tom what time he was going to the theater the following day.

- indirect speech "are" hiện tại chuyển thành qk "were" + giữ nguyên vế sau.

chúc b học tốt^^_ xin vote 5sao ạ^^

1. It took us an hour to do the English test last week.

2. We haven't seen Tome since he moved to London.

3. If people didn't use too many cars for transportation, the environment would not be seriously polluted

4. Mark asked Tom what time he was going to the theater the following day.